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A Sudoku with 24 clues, dihedral symmetry (a 90° rotational symmetry, which also includes a symmetry on both orthogonal axis, 180° rotational symmetry, and diagonal symmetry) is known to exist, but it is not known if this number of clues is minimal for this class of Sudoku. [5]
Lattice multiplication, also known as the Italian method, Chinese method, Chinese lattice, gelosia multiplication, [1] sieve multiplication, shabakh, diagonally or Venetian squares, is a method of multiplication that uses a lattice to multiply two multi-digit numbers. It is mathematically identical to the more commonly used long multiplication ...
Light Up (puzzle) Moderately difficult Light Up puzzle (solution) Light Up (Japanese: 美術館 bijutsukan, art gallery), also called Akari (明かり, light) is a binary-determination logic puzzle published by Nikoli. As of 2011, three books consisting entirely of Light Up puzzles have been published by Nikoli.
Cantor's diagonal argument (among various similar names [note 1]) is a mathematical proof that there are infinite sets which cannot be put into one-to-one correspondence with the infinite set of natural numbers – informally, that there are sets which in some sense contain more elements than there are positive integers.
0-9 22 The 22 m line, marking 22 metres (72 ft) from the tryline. 89 An "89" or eight-nine move is a phase following a scrum, in which the number 8 picks up the ball and transfers it to number 9 (scrum-half). 99 The "99" call was a policy of simultaneous retaliation by the 1974 British Lions tour to South Africa, (the 99 comes from the British emergency services telephone number which is 999 ...
The "nine dots" puzzle. The puzzle asks to link all nine dots using four straight lines or fewer, without lifting the pen. The nine dots puzzle is a mathematical puzzle whose task is to connect nine squarely arranged points with a pen by four (or fewer) straight lines without lifting the pen. The puzzle has appeared under various other names ...
Cluedo (/ ˈkluːdoʊ /), known as Clue in North America, is a murder mystery game for three to six players (depending on editions) that was devised in 1943 by British board game designer Anthony E. Pratt. The game was first manufactured by Waddingtons in the United Kingdom in 1949.
Slitherlink is played on a rectangular lattice of dots. Some of the squares formed by the dots have numbers inside them. The objective is to connect horizontally and vertically adjacent dots so that the lines form a simple loop with no loose ends. In addition, the number inside a square represents how many of its four sides are segments in the ...